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No. 617,7". Patontod lan. I7, |899. W. L. BEALL. CULTIVATDR TO0TH.

(Lm Ik( loh. 16, 1000.) (lo ladet.) 2 Sluts-Shut l.

No. 6|7,7II. Patented Ian. I7, |899. W. L. BEALL.

CULTIVATOII TOOTH.

(Amicitia 1M hb. 16, 1098.) (Ilo letal.)

2 Shoah-Shut g.

o l l d, Nl e l li WIV. TEE-1LE- LQ/UMTQ 9 UNITED STATES PATENT OFFICE.

'ILLIAM L. BEALL, OF ALBION, MICHIGAN, ASSIGNOR TO TIIE GALF. MANUFACTURING COMPANY, OF SAME PLACE.

CU LTIVATOR-TOOTH.

SPECIFICATION forming part of Letters Patent No. 617,711, dated January 17, 1899. Application led February 16, 1898. Serial No.670.574. (No model.)

To all u-homif may concern,.-

Be it known that I, WILLIAM L. BEALL, a citizen of the United States,residingat Albion, in the county of Calhoun and State of Michigan, have invented certain new and useful Improvements inCultivator-Teeth; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

M y present invention relates to cultivatorteeth, and more especially to such as are so supported in operative position that they will yield when brought into contact with a rigid obstruction.

The invention consists of cert-aiu new constructions and combinations of parts whereby improved results are secured and a better and more eective -elding cultivator-tooth produced.

In the accompanying drawings I have shown the best form in which I have con templated embodying my invention, and said invention is disclosed in the following description and claims.

In the said drawings, Figure 1 is a side elevation of a cultivator with my improved teeth attached. Fig. is an enlarged side elev tion of the distinctive features of said tooth. Fig. 3 is a longitudinal vertical section of the construction shown in Fig. 2. Fig. 4 is a rear elevation, and Fig. 5 is a detail view.

In the drawings, A is the cultivator-beam, having the downwardly bent or extending portion a. To the lower end of a the toothshank B is pivoted at b. This is preferably made in two parts, butin every case provided with a slot or recess to receive the lower end a of the beam. The tooth-shank has a rearwardly-extending part b of segmental form, which is in this instance provided with a number of apertures to receive a bolt securing the lower member C of the toggle-lever. This lower member is composed of two links c c', and these links are pivoted to the toothshank B at c2. D, the upper member of the toggle-lever, is composed of a single casting having its two ends bent rearwardly. This member of the lever is provided with a slot extending entirely through the same or transversely and nearly from end to end, the two outer walls only being united at the ends dd'. The closed end d forms a permanent stop which limits the movement of the toggle-lever, so that it can never pass quite to a rightline position. This member of the lever is pivoted to the beam at e, and the links forming the lower member are pivoted to D at e' by short rivets or bolts, one on each side of the beam A.

Between the links c c' is the inverted-U- shaped yokc C', which has its legs riveted or otherwise secured to the links c c'. A screw or bolt c3 is passed through the middle of the yoke, fittinga threaded aperture in the same, and has upon it a jam or clamping nut c. The end of this screw or bolt normally rests against the rear edge of the part a of the beam, and by turning this bolt or screw inward or outward the position of the togglelever is adjusted. The jam-nut serves to lock the bolt against accidental displacement.

The spring-pressure which serves to normally maintain the toggle-lever in place to hold the tooth-shank and its attached tooth in the desired position for work is applied to the casting D above the pivot e. This pressure is elected by the coiled spring F. A roof extends through the spring and engages the bracket or abutment a', secured to the beam. The opposite end of the rod fis bifurcated and provided with the friction-roll f Two links g g are pivoted to the axis of the roll f' and have their opposite ends pivoted to the beam A. The friction-roll is provided with a central portion of such a width as to engage the slot in the upper part of the lever D and on each side a shoulder to engage the sides or the outer faces of the walls of the slot, so that the roll is kept from moving laterallyout of engagement with thelever. The face of the upper end of the arm D, engaged by the roll f', is not of an even curvature. From the normal point of engagement by the roll to the point .r it is of such form as to act when the end of the lever moves forward quite strongly to compress the spring, but from that point to the end of the lever it is but slightly out of a true circle `drawn from the pivot e as a center. The rod fis provided with a screw-thread adjacent the roll f upon which is a nutl``, by incausof which thc force of the spring can be adjusted.

The operation of this construction will bo easily understood b v those familiar with this clam` of devices. The l'orcc of the sprin g normally holds the toggle C D as nearly in a straight line as the adjustment of the screw c"` will permit.. In case the cult-ivator-tooth should come in contact with a rigid obstacle the tooth-shank ll will turn or swing backward, flexing the toggle. At the same time as the upper end of the lever D moves inward its curved upper face acts as a cani against the roll f to compress the spring l`. As soon as the roll reaches the point a: nearly the full compression of the spring has been effected.

A further movement of the lever in the same. g

direction but slightly increases the pressure i' forward is to cause them to swing the roll out- .5 ward, increasing the leverage of the spring. f

The series of openings in the segmental portion b' of the tooth-shank enables the latter to be set in the position desired. The links g g' by their action in raising rollf' and increasing the leverage of the spring render it unnecessary that the spring should be as the spring, the said cam being substantially as described whereby the initial bending of It will be noted that the curved face of the arm D acts as a cam to compress the spring i much compressed as in other constructions in which the leverage remains constant.

and that the compression is less than it would f be were there a direct connection between them.

\Vhat I claim, and desire to secure by Let the inverted-U-shaped-yoke and the adjustters Patent, is-

1. In a cultivator-tooth, the combination with the toggle-lever for holding the toothshank in position, of a spring for preventing the flexing or bendingof the lever, the attachment of the spring including means for increasing its leverege as the lever is flexed or line position, one end of said slotted member bent, substantially as described.

In a cnltivator-tooth, the combination with the toggle for holding the tooth-shank in position, of a coiled spring engaging one part of said lever to prevent the flexing or bending of the lever, and means whereby the flexing of the lever will move the point engaged by the spring farther from the pivot of the engaged part, substantially as described.

3. In a cnltivator, the combination with the toggle-lever for holding the tooth-shank in normal position, of a spring engaging one part of the lever for preventing the bending of the lever, the connection between the two including a cam construction for compressing the spring, whereby the compression of thc spring is more easily effected, substantially as described.

4. In a cnltivator-tooth, the combination with the toggle-lever for holding the toothshank in position, one part of said lever provided with a curved or cam surface, of a spring bearing upon said cam-surface and the links connecting thc spring to the beam, substantially as described.

In a. cultivator-tooth, the combination with the toggle-lever for holding the toothshank in position, of a friction-roll bearing against one of the members of said lever a spring forcing the roll against said lever and the links pivoted to said roll, substantially as described.

6. In a cult-ivator-tooth, the combination with the toggle-lever for holding the toothshank in position, a spring for preventing the flexing of the lever, the part of the lever receiving the force of the spring being provided with a curved or cam face compressing.,r

the lever compresses the spring but the further movementthereof has but little etect upon the spring, substantially as set forth.

T. In a cnltivator-tooth, the combination vith the beam and the toggle-lever for holdng the tooth-shank, of the stop consisting of ing-screw, substantially as described.

S. In a. cnltivator the combination with the beam and tooth-shank of a toggle-lever having for one member the slotted member D embracing the beam and spring-pressnre devices tending to maintain the lever in a rightserving as a stop, substantially as described. In testimony whereof I aix my signature in the presence of two witnesses'.

WILLIAM L. BEALL.

'itn esses:

F. T. LAWLER, W. D. BALL.V

IOO 

